It is known that underwater sound waves are greatly slowed, which allows no special devices to hear what is happening on the surface of the water. However, a group of international experts has developed a simple device that allows you to hear the speech of the people over the water a few metres from the diver.
The fact that the loss of impulse of the sound wave at the transition from air into water is about 30%, which allows normal human ear to catch the sounds. The new device is based on the use of latex particles, which are stretched on an aluminium plate, placed on a special membrane. Such a special membrane attached to the ear and increases the conductivity several tens of times, and the sound is almost not distorted, allowing you to hear everything that happens above the water surface. Scientists have managed to ensure that losses due to the sensitivity of the membrane kompensiruet, and to make these losses ultimately amounted to no more than 6%.
It is unknown at what depth and how do you plan to use a new device, because it is attached around the external auditory canal, and the ears of the diver must remain open in order for the device to work properly.